There's a difference in polar response at high frequencies that can matter in certain recording environments, depending on the character of the reflected / diffuse sound energy. It's in the region of 8 - 10 - 12 kHz mostly. Cardioid and supercardioid condenser microphones pretty much all tend to have some response elevation off-axis relative to their 0-degree response; these two "V" capsules have distinctly less of that elevation than their "non-V" counterparts.
Now, the 0-degree response at high frequencies of these two "V" capsules isn't as flat as in their "non-V" counterparts, so that's a factor as well. The MK 4 V, for example, is very useful when you can't mike quite as closely as you might prefer.
But the farther your mikes are from the actual sound sources, the greater the proportion of sound you'll pick up from off-axis, and the more that slight difference in polar pattern will matter to the overall sound impression.
Back when Schoeps used to make a three-pattern capsule (omni, cardioid, figure-8), the MK 6, I was a huge fan of the way it sounded in the cardioid setting (as are/were many other people from what I hear). A big part of that was because it had less off-axis high-frequency rise than the forward-facing MK 4 or MK 5. No currently-available cardioid capsule has quite those same characteristics, unfortunately.